The best bulletproof water tight backpack - Exped Torrent 40 Backpack

I purchased my first Exped torrent for a 100+ trip paddling down the Mississippi River. I considered it arguably the best gear purchase I've ever made. The pack will not allow water in [800 deniers], is comfortable to wear, has an internal storage pocket, and the external gear loops allow just about anything to be attached to it. Also, if not overloaded, it will float.

It can be a bit pricey but it is worth the expansive---I carried a laptop in it down the Mississippi!